MSA ORION Manual page 27

Four-Head Gas Detector: MSA Orion
g) Wait until readings stabilise. This should take no longer than 2 minutes. The
Orion must display readings within the limits indicated in Table 5. These limits
are also printed on the gas cylinder.
Gas
Combustible
Oxygen
Carbon monoxide
Hydrogen sulphide
h) Turn off the regulator and disconnect the hose.
i) Wait until the readings recover and show clean air.
If the calibration challenge readings are within the tolerances in Table 5, move on to
clearing peaks as described in
and STEL readings as described in
page 22.
the pump' on page 23, and the
If the readings are not within these tolerances, the Orion has failed the challenge
test. Perform a field calibration.
D.I. Rec-ommended Practice
FILE: W:\NB\RP HMRU\Orion\Frame Ver 02\Orion.fm
NOTE
The Orion will alarm for all gases. Acknowledge the alarms as they
occur and continue.
Table 5: Calibration challenge results
Concentration
58% LEL optimum (52 – 64% allowable)
15% (13 – 17% allowable)
300 ppm (270 – 330 ppm allowable)
10 ppm (9 – 12 ppm allowable)
You can then fit the wand, test the pump as described in
Section 3.3.6: 'Clearing peaks' on page
Section 3.3.7: 'Clearing STEL and TWA' on
Orion will be ready for operation.
Version 02 Issued February 2011
© Copyright State of NSW (Fire and Rescue NSW) 2011
19
21, and TWA
Section 3.3.8: 'Test